We started subtraction today. Remember, we don't use the algorithm (this example). We will use the strategies of number line and base 10. Today's focus was on number line. You can help your child be better prepared for subtraction strategies by mentally subtracting 10s and 100s from given numbers. This is a difficult skill that requires practice. For example, ask, "What's 235-40?" Your child needs to be able to mentally count back and get the answer, 195.